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Original question:

PGA309EVM-USB: How to generate a coefficient to correct for nonlinearity

PGA305: PGA305

Francisco Requena
Intellectual 410 points
Part Number: PGA305
Other Parts Discussed in Thread: PGA309EVM-USB, PGA309,

from this forum post "PGA309EVM-USB: How to generate a coefficient to correct for nonlinearity" i tried to download the files to calculate the coeficients but the links are broken.

please provide new links

  • 0
    TI__Mastermind 31655 points

    Hello Francisco,

    The spreadsheet calculator from the post you have linked is actually for determining the output values of a resistive bridge for use with the PGA309 sensor emulator board. You put in the specifications of your resistive bridge and the calculator outputs the values that you should program into the sensor emulator board. From there you can use the sensor emulator board as a replacement for the resistive bridge to complete calibrations quickly with the PGA309. The coefficients are calculated in the PGA309 GUI after the calibration is complete, and they are not calculated in the spreadsheet.

    Additionally, for the PGA305 the coefficients are calculated differently, so the best option is to use the PGA305 GUI to calculate the coefficients for use with the PGA305. 

    Regards,

  • 0 in reply to Scott Cummins
    Intellectual 410 points

    Scott

    thanks by the clarification on that Xl sheet. 

    I went back to the PGA305 EVM to check the calibration procedure and found a bug in ADC Graph GUI: the data isn't  converted from 24 to 32 or 64 bits correctly. That give me a few minutes battle.

    Despite that bug , I notoced that the EVM PGA305 GUI User Manual  doesn't cover the in detail the I2C DataOut Mode option, so I tried and I could not get DATA_OUT using the COMBUF Page.

    Please provide me with a detailed example that produces a valid   DATA_OUT thru  the COMBUF Page, using this PGA 305 EVM .

    Please advice.

  • 0 in reply to Francisco Requena
    TI__Mastermind 31655 points

    Hi Francisco,

    I've addressed those concerns in your other thread here: https://e2e.ti.com/support/sensors/f/1023/p/842129/3118086#3118086

    Regards,

  • 0 in reply to Francisco Requena
    Intellectual 410 points

    Hi Scott

    I apologize  If i didn't explain myself well earlier,

    Let see if I can better explain, the only issue I have:

    I had followed the procedures on PGA305 GUI User Manual and I am using the PGA305EVM.

    I can get uncorrected Pressure PADC and uncorrected Temperature TADC using the COMBUF, but I can't get any numbers different than zero from the TC and NL corrected  DATA_OUT output of the COMBUF.

    Please provide me with an example using  the PGA305 EVM to get DATA_OUT output of the COMBUF.

    Regards 

     

  • 0 in reply to Francisco Requena
    TI__Mastermind 31655 points

    Hi Francisco,

    I have answered your question in the other thread here: https://e2e.ti.com/support/sensors/f/1023/p/842129/3121397#3121397

    Since this discussion about the COMBUF output is unrelated to the original question from this thread, please post any followup questions to the thread linked above.

    Regards,